$ git clone -n https://src.fedoraproject.org/rpms/nextcloud.git /var/lib/mock/f39-build-1497770-34645/root/chroot_tmpdir/scmroot/nextcloud
Cloning into '/var/lib/mock/f39-build-1497770-34645/root/chroot_tmpdir/scmroot/nextcloud'...
$ git fetch origin 23e9f1764b71ba7b49384fdf12d3e78a4b803f5c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nextcloud
 * [new ref]         23e9f1764b71ba7b49384fdf12d3e78a4b803f5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23e9f17 Fix post install bugs